Nginx正则表达式位置

Question

This regular expression doesn't work.

Below is the one.

    location ~* /a2aEx\?.*$ {

    }

I requested to /a2aEx?AID=ASA_1&BID=1 but NGINX respond with 404 status

However if I fix it to below, it works fine, returning 200 status

    location ~* /a2aEx.*$ {   # remove `\?`

    }

I verify my regular expression on Python with below code.

 text = "/a2aEx?AID=ASA_1&BID=1"

 reObj = re.match("/a2aEx\?.*$", text)
 print reObj.string  # it returns `/a2aEx?AID=ASA_1&BID=1`

Seeing the symptom, the escape char( \\ ) doesn't work as I expect.

Answer 1

Your regular expression is fine. The issues lies with how Nginx is examining the incoming request.

Nginx treats anything after ? as a query string in the request. location blocks match against the $uri variable ( /a2aEx ) in your example. Location blocks do not examine the $args variable, which is what you are attempting to match against.

Your second example matches the $uri variable correctly.

To operate on the arguments, you can use Nginx's if operator, but it is generally discouraged.

Answer 2

An escape problem?

Try one of the following:

• double the backslash

   location ~* /a2aEx\\\\?.*$ { 

• put the regex in quotes

   location ~* "/a2aEx\\?.*$" { 

• replace by a character class

   location ~* "/a2aEx[?].*$" {